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Listed under:  Mathematics  >  Geometry  >  Shapes (Geometry)  >  Circles  >  pi
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A stone's throw from the true value of pi

Ancient Egyptian mathematicians worked out the value for pi. Find out just how close their approximate value came to the true value. See how the relationship between the area of a circle and the area of a square can be explained using rounded stones, and how this can also be used to work out an approximate value for pi.

Interactive resource

Trig radians: introduction

Use radians to measure angles. Identify key angles in their radian form, for example π/6=30°. Convert angles in degrees (up to 360) to angles in radians. Solve measurement problems using angles in radians. Determine arc lengths using radians. This learning object is one in a series of seven objects. Three objects in the ...

Teacher resource

Periodic functions - unit of work

This unit focuses on periodic functions and is part of a university preparation course for those wishing to study mathematics and science courses such as engineering.


What is pi?

This is an online resource that introduces the concept of pi as the ratio of a circle's circumference to its diameter. The buttons at the bottom of the screen provide links to an animated demonstration of how an approximation of pi can be determined by measuring the circumference, the first 2000 digits of pi and a mnemonic ...

Teacher resource

Investigating irrational numbers including pi

This is a website designed for both teachers and students that refers to irrational numbers including pi from the Australian Curriculum for year 8 students. It contains material on the real number system and explains how irrational numbers were introduced historically to this system. Information on constructing rational ...

Teacher resource

reSolve: Circumference

This sequence of three lessons explores the properties of circles, in particular the relationship between the diameter and circumference. In the first lesson, students use a cylinder containing three tennis balls to understand that a circumference is 'three and a bit' times the diameter. They then complete five different ...